Dirt Bike Carburertor Main Jets
Dirt Bike Carburetor Main Jets & Jet Needles for Mikuni Carbs on Honda, Yamaha & KTM at JJ Motorsports
Fine-tune your dirt bike's fuel mixture for optimal power and efficiency with premium carburetor main jets and jet needles from JJ Motorsports. Our selection includes high-precision brass main jets (sizes 100-140) and tapered jet needles designed for consistent mid-range performance, smooth throttle response, and easy tuning in motocross, enduro, and trail riding. Compatible with Mikuni VM series carbs on popular models like Honda CRF, Yamaha YZ/WR, Kawasaki KX, Suzuki RM, and KTM SX/EXC, these Japanese-made components ensure accurate metering, reduced lean spots, and reliable operation in dusty, high-RPM conditions. From 4/042 main jets for VM18/26 carbs to J8-series needles for mid-throttle control, stock up on the parts needed for a full carb rebuild or jetting upgrade.
Shop trusted brands like Mikuni for OEM-quality precision. Explore related categories such as dirt bike carburetor rebuild kits for complete maintenance or dirt bike air and fuel for reeds and filters.
Top Dirt Bike Carburetor Main Jets & Needles
- Mikuni Jet Needle J8-6F08 – Precision tapered jet needle for mid-range fuel control in Mikuni VM series carbs; fits various OE applications, made in Japan for smooth throttle response.
- Mikuni Main Jet #100 - 4-Pack (4/042-100) – Brass main jet pack for VM18, VM24/26, TMX carbs; 6mm diameter, 12mm length, ideal for leaner mixtures in dirt bikes.
- Mikuni Main Jet #125 - 4-Pack (4/042-125) – High-flow brass jets for richer high-RPM tuning; compatible with Mikuni VM series and OE carbs on Honda, Yamaha, and KTM models.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
MIKUNI Jet Needle J8-6EJ12-59
MIKUNI
$10.50Precision fuel mixture control at mid-range throttle positions is essential for consistent carburetor performance, and OEM replacements can be difficult to source. The MIKUNI Jet Needle J8-6EJ12-59 restores factory-spec tuning for compatible Mikuni VM...6EJ1259- SKU:
- 6EJ1259
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- NEEDLE
- UNITS:
- EACH
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- MODEL:
- J8-6EJ12-59
$10.50Qty in Cart: 0Quantity:Price:$10.50Subtotal: -
MIKUNI Jet Needle J8-6EJ12-60
MIKUNI
$10.50Fine-tuning your carburetor's mid-range fuel mixture requires precision, and the MIKUNI Jet Needle J8-6EJ12-60 delivers exactly that. Whether you're dialing in a race engine or optimizing a custom build, this OEM-spec needle ensures consistent fuel...6EJ1260- SKU:
- 6EJ1260
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- NEEDLE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- J8-6EJ12-60
- UNITS:
- EACH
$10.50 -
MIKUNI Jet Needle J8-6F15
MIKUNI
$10.50Precision fuel mixture control in the mid-range throttle band is essential for responsive acceleration and smooth power delivery. The MIKUNI Jet Needle J8-6F15 is engineered to fine-tune your carburetor's performance characteristics, ensuring optimal...6F15- SKU:
- 6F15
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- NEEDLE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- J8-6F15
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
$10.50 -
MIKUNI Super BN Series Pilot Jet - 4-Pack N100606-625
MIKUNI
$5.20Precision fuel delivery starts with the pilot jet, and the MIKUNI Super BN Series delivers the metering accuracy your engine needs at low throttle positions and idle. A properly-sized pilot jet eliminates stumbling, hesitation, and rich-running...KN100606625- SKU:
- KN100606625
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MODEL:
- MIKUNI
- UNITS:
- 4 PACK
- PRODUCT NAME:
- JET
- RIDING STYLE:
- WATERCRAFT
- JET SIZE:
- 62.5
- TYPE:
- PILOT
$5.20 -
MIKUNI Super BN Series Pilot Jet - 4-Pack N100606-65
MIKUNI
$5.20Precision fuel delivery starts with the right pilot jet—the MIKUNI Super BN Series ensures accurate low-speed throttle response and consistent idle quality across varying ambient conditions. If you're tuning a carbureted engine for reliability and...KN10060665- SKU:
- KN10060665
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 65
- MODEL:
- MIKUNI
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 4 PACK
- PRODUCT NAME:
- JET
- TYPE:
- PILOT
$5.20 -
MIKUNI Main Jet - #102.5 - 4-Pack N102221-1025
MIKUNI
$14.55Precise fuel metering is critical to carburetor performance, and the right main jet size directly impacts throttle response, fuel economy, and engine reliability. This MIKUNI #102.5 main jet is engineered to deliver accurate fuel flow for CV and Power...KN1022211025- SKU:
- KN1022211025
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 4 PACK
- MODEL:
- MIKUNI
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
- JET SIZE:
- 102.5
$14.55 -
MIKUNI Main Jet - #105 - 4-Pack N102221-105
MIKUNI
$14.55If your CV or Power Jet carburetor is running rich or fouling plugs, a properly sized main jet is the foundation of clean, efficient combustion. The MIKUNI #105 main jet delivers the precise fuel metering your engine needs for optimal performance across...KN102221105- SKU:
- KN102221105
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- BRASS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- MIKUNI
- PRODUCT NAME:
- JET
- RIDING STYLE:
- WATERCRAFT
- JET SIZE:
- 105
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- TYPE:
- MAIN
- UNITS:
- 4 PACK
$14.55 -
MIKUNI Main Jet - #107.5 - 4-Pack N102221-1075
MIKUNI
$5.20If you're tuning a carbureted engine and need precise fuel delivery, a quality main jet is non-negotiable—it directly controls your air-fuel ratio under load and dictates whether your engine runs lean or rich. The MIKUNI #107.5 main jet is the OE...KN1022211075- SKU:
- KN1022211075
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 4 PACK
- MODEL:
- MIKUNI
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
- JET SIZE:
- 107.5
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
$5.20 -
MIKUNI Main Jet - #115 - 4-Pack N102221-115
MIKUNI
$14.55Fine-tuning your carburetor's fuel delivery is critical for achieving optimal power output and throttle response. The MIKUNI #115 main jet directly controls mid-range and full-throttle fueling, making it essential for riders and racers who demand...KN102221115- SKU:
- KN102221115
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- JET SIZE:
- 115
- MODEL:
- MIKUNI
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- UNITS:
- 4 PACK
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
$14.55 -
MIKUNI Main Jet - #120 - 4-Pack N102221-120
MIKUNI
$14.55Fine-tuning your carburetor's fuel delivery is essential for achieving optimal air-fuel ratio and consistent performance across your RPM range. The MIKUNI #120 Main Jet directly controls mid-range and full-throttle fueling, making it a critical component...KN102221120- SKU:
- KN102221120
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- JET SIZE:
- 120
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- UNITS:
- 4 PACK
- MODEL:
- MIKUNI
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
$14.55 -
MIKUNI Main Jet - #135 - 4-Pack N102221-135
MIKUNI
$14.55If your carburettor is running too lean or you're experiencing hesitation during acceleration, a main jet swap is often the quickest solution. The MIKUNI #135 main jet is a direct replacement for OE CV and Power Jet carburetors, giving you precise fuel...KN102221135- SKU:
- KN102221135
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- JET SIZE:
- 135
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- UNITS:
- 4 PACK
- MATERIAL:
- BRASS
- MODEL:
- MIKUNI
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- WATERCRAFT
$14.55 -
WSM Keihin High-Speed Jet 006-7130
WSM
$2.17If you're running a Keihin CDK 2 carburetor on your watercraft, jet sizing directly impacts throttle response, fuel delivery consistency, and overall engine performance across the RPM band. The WSM Keihin High-Speed Jet 006-7130 is engineered to precise...0067130- SKU:
- 0067130
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- BRASS
- MODEL:
- KEIHIN
- JET SIZE:
- 130
- TYPE:
- MAIN
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- JET
- UNITS:
- EACH
$2.17Qty in Cart: 0Quantity:Price:$2.17Subtotal: -
WSM Keihin High-Speed Jet 006-7132
WSM
$2.17The WSM Keihin High-Speed Jet 006-7132 is engineered for precise fuel atomization in high-RPM conditions, delivering consistent jetting performance when your watercraft demands maximum throttle response. This OEM-specification component ensures your...0067132- SKU:
- 0067132
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- MATERIAL:
- BRASS
- TYPE:
- MAIN
- UNITS:
- EACH
- JET SIZE:
- 132
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- KEIHIN
- PRODUCT NAME:
- JET
$2.17Qty in Cart: 0Quantity:Price:$2.17Subtotal: -
WSM Keihin High-Speed Jet 006-7138
WSM
$2.17If you're running a Keihin CDK 2 carb on your watercraft and need precise fuel delivery at high RPM, the WSM Keihin High-Speed Jet 006-7138 is essential for maintaining optimal performance across your entire power band. This OEM-equivalent jet ensures...0067138- SKU:
- 0067138
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- MAIN
- MATERIAL:
- BRASS
- JET SIZE:
- 138
- MODEL:
- KEIHIN
- PRODUCT NAME:
- JET
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$2.17Qty in Cart: 0Quantity:Price:$2.17Subtotal: -
WSM Keihin High-Speed Jet 006-7142
WSM
$2.17Fine-tuning your watercraft's fuel delivery requires precision jet sizing matched to your specific engine modifications and operating conditions. The WSM Keihin High-Speed Jet 006-7142 ensures optimal carburetor calibration for peak performance and...0067142- SKU:
- 0067142
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- TYPE:
- MAIN
- UNITS:
- EACH
- JET SIZE:
- 142
- MATERIAL:
- BRASS
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- KEIHIN
- PRODUCT NAME:
- JET
$2.17Qty in Cart: 0Quantity:Price:$2.17Subtotal: -
MIKUNI Needle Jet 990-793-004-Q-4
MIKUNI
$15.49Precise mid-range throttle response is critical for carburetors operating in the 1/4 to 3/4 throttle range, and the MIKUNI Needle Jet 990-793-004-Q-4 gives you direct control over this vital tuning window. Whether you're dialing in a race engine or...159Q4- SKU:
- 159Q4
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- JET SIZE:
- Q-4
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MODEL:
- TYPE 159
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- MATERIAL:
- BRASS
- RIDING STYLE:
- OFF-ROAD
$15.49 -
MIKUNI Needle Jet 990-793-004-Q-6
MIKUNI
$15.49Precise carburetor tuning is the foundation of reliable engine performance across the mid-range throttle spectrum, and the MIKUNI Needle Jet 990-793-004-Q-6 gives you the control to dial in your fuel mixture with surgical accuracy. Rather than guessing...159Q6- SKU:
- 159Q6
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- JET
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- TYPE:
- NEEDLE
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- JET SIZE:
- Q-6
- MATERIAL:
- BRASS
- MODEL:
- TYPE 159
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$15.49 -
MIKUNI Needle Jet 990-793-004-Q-8
MIKUNI
$15.49Precise carburetor tuning hinges on quality needle jets, and the MIKUNI 990-793-004-Q-8 delivers the fine-control adjustability that separates dialed-in engines from guesswork. This genuine Mikuni component enables mid-range fuel mixture optimization—the...159Q8- SKU:
- 159Q8
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- JET SIZE:
- Q-8
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- FEATURES:
- FOR VM 30 MM - 36 MM SPIGOT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- JET
- TYPE:
- NEEDLE
- MATERIAL:
- BRASS
- MODEL:
- TYPE 159
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$15.49 -
MIKUNI Main Jet #260 - 4-Pack 4/042-260
MIKUNI
$5.20Precise fuel metering is non-negotiable in carbureted performance engines, and main jet selection directly controls your air-fuel ratio across the mid-range and top-end RPM band. If you're running Mikuni VM or TMX carburetors and experiencing lean...KM4042260- SKU:
- KM4042260
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH:
- 12 MM (0,47')
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- FEATURES:
- FOR VM CARBURETORS
- JET SIZE:
- 260
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- MAIN
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- SNOW
- UNITS:
- 4 PACK
$5.20 -
MIKUNI Main Jet #190 - 4-Pack 4/042-190
MIKUNI
$14.56Precise fuel metering is fundamental to carburetor tuning, and the right main jet directly impacts throttle response, fuel economy, and engine performance across the RPM band. Whether you're fine-tuning a Mikuni VM or TMX series carburetor for track...KM4042190- SKU:
- KM4042190
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- FEATURES:
- FOR VM CARBURETORS
- OVERALL DIAMETER IMPERIAL:
- 0.24'
- OVERALL LENGTH METRIC:
- 12 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
- JET SIZE:
- 190
- OVERALL DIAMETER:
- 6,00 MM (0,24')
- OVERALL DIAMETER METRIC:
- 6.00 MM
- OVERALL LENGTH:
- 12 MM (0,47')
- OVERALL LENGTH IMPERIAL:
- 0.47'
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- PRODUCT NAME:
- JET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- TYPE:
- MAIN
- HEAD TYPE:
- HEX HEAD
- MATERIAL:
- BRASS
$14.56
